Web Sockets

WebSocket is a computer communications protocol, providing full-duplex communication channels over a single TCP connection

Websockets are used in case of real-time interactive applications

WebSocket is a thin, lightweight layer above TCP. This makes it suitable for using “subprotocols” to embed messages

using STOMP(Streaming Text Oriented Messaging Protocol) messaging with Spring to create an interactive web application. STOMP is a subprotocol operating on top of the lower-level WebSocket.

Configure Spring for STOMP messaging

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

  @Override
  public void configureMessageBroker(MessageBrokerRegistry config) {
    config.enableSimpleBroker("/topic");
    config.setApplicationDestinationPrefixes("/app");
  }

  @Override
  public void registerStompEndpoints(StompEndpointRegistry registry) {
    registry.addEndpoint("/gs-guide-websocket").withSockJS();
  }

}

the connection between a server and a cient need two sockets, server socket that is created using spring boot framework and the client socket is created using javascript.